MAX6639_REG_TARGTDUTY
res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(channel), &val);
return regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(channel),
err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), target_duty);
case MAX6639_REG_TARGTDUTY(0):
case MAX6639_REG_TARGTDUTY(1):